Eye-protecting glasses



iiiass Patented June, is, 1945 UNITED STATES PA ENT OFFJCE 7 a was I 1'. Road,

GlllsWmC rning, N. 1., asslgnor orning, N. 2., a corpora- Application Deeanber 28, 1942, SerialNo. 410.40: a

I scum. (c1. roe-54$ 'Ihis' invention relates to eye-protecting,

glasses, and particularly'to those known aswelde'rs' glasses which for goggles and eye 7 shields. employed in welding. The absorption characteristics of prior welders glasses are substantially uniform throughout the visible. spectrum and such glasses have been satisfactory for use where the glare to be absorbed is due primarily to the incandescenoe oi the metal or metals being welded. In the welding oi aluminum there is substantially no incandescent glare because aluminum melts at a relatively low temperature and does notobecome highly incandescent during welding. However, in the welding of aluminum a large amount of flux is ordinarilyemployed and the action of the welding irame on the nu: creates a glare whichthe prior glasses are unable entirely to absorb even though the density oi. the coloration'oi' the glass or its thickthe red and inira-red and in the ultra-violet.

Another object is to provide an eye protecting sla'ss which will absorb glare and specific radiations. v p

Ano er oblect is to provide an eye-protecting ch is particularly suitable to: use in welding aluminum.

I have found that'the above and other objects 8102 I 80 N820 17 B20: 2 118.20: 10 NdrOsL I 10 C110 v .8 (Jr-r0: .4

- As a source of neodymium I have used a pr not known commercially as "rare earth hydrates" comprising chiefly'a mixture of the hydroxides of lanthanum and neodymium in approximately equal proportions. The equivalent content 01 neodymium oxide in this material'is absorbing the glare about 30%-35% NdiOa. Other neodymium containing materials may also be used.

The above composition has a bright green color andin3mm.thiclmessisanexcellenteyeprotecting glass particularly suitable ior use in the welding 01 aluminum, the green color being substantially absorptive to heat rays and-long wave radiations. It is to be understood that the color saturation or density and the v hue of my new glass may be varied by altering the proportions oith'e coloring oxides. .Joreover i1 desired, other combinations of the recited coloring oxides may be employed, in each instance neodymium oxide being present for the purpose of neutralizing or due to heat nun I claim:' 1.-A. colored eye-protecting silicate glass coloring constituents 01! which consist of 5% to Nd oa, .5% to 1.5% CuO and 3% to 3% 2; colored eye-protecting silicate glass the coloring constituents of which consist oi about maybeattained'bymeansoiaglasswhichcon tains about 5% to 20% at NdsOs together with about .02% to 5% of the oxides oi chromium and copper. As examples-oi slsss'es which are suit 10% NdrOs, 3% CR0 and .4% CD03.

3. An eye-protecting glass which consists approximately 01 B102, 17% Rio, 2% 3e08,

nmmsonRnoon. 

